21-4x=-4x+21

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Solution for 21-4x=-4x+21 equation: 



21-4x=-4x+21

We move all terms to the left:

21-4x-(-4x+21)=0

We get rid of parentheses

-4x+4x-21+21=0

We add all the numbers together, and all the variables

=0

x=0/1

x=0

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